The problem is if people need cash the banks have to sell their bonds at a 40% loss and they go bankrupt. They want to calm the people so that everyone will just "trust" them. However, because of inflation people are going bankrupt right and left and need their money and btw, no one trusts them. But even if somehow they could calm them down the problem is global, anyone with US bonds has this problem. As long as they don't sell maybe things will get better, but, wait for it, China has enough bonds that they could cause a collapse.